ADV
ANCEINFORMA
TION
TMS320F28377S, TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881A – AUGUST 2014 – REVISED JUNE 2015
5.7.3
Clock Specifications
5.7.3.1
Clock Sources
lists four possible clock sources.
Table 5-5. Possible Reference Clock Sources
CLOCK SOURCE
MODULES CLOCKED
COMMENTS
INTOSC1
(1)
Can be used to provide clock for:
Internal oscillator 1.
Zero-pin overhead 10-MHz internal oscillator.
•
Watchdog block
•
Main phase-locked loop (PLL)
•
CPU-Timer 2
INTOSC2
(1) (2)
Can be used to provide clock for:
Internal oscillator 2.
Zero-pin overhead 10-MHz internal oscillator.
•
Main PLL
•
Auxiliary PLL
•
CPU-Timer 2
XTAL
(1)
Can be used to provide clock for:
External crystal connected between X1 and X2 pins. On-chip crystal
oscillator enables the use of external crystal/resonator to provide
•
Main PLL
time base when connected to the device.
•
Auxiliary PLL
•
CPU-Timer 2
GPIO_AUXCLKIN
Can be used to provide clock for:
Single-ended 3.3-V level clock source. GPIO133/AUXCLKIN pin
should be used to provide the input clock.
•
Auxiliary PLL
•
CPU-Timer 2
(1)
For power savings, both zero pin internal oscillators and the XTAL oscillator can be individually powered down if they are not being used
by the application.
(2)
On reset, internal oscillator 2 (INTOSC2) is the default clock source for both system PLL (OSCCLK) and auxiliary PLL (AUXOSCCLK).
60
Specifications
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